27744421 has 2 divisors, whose sum is σ = 27744422. Its totient is φ = 27744420.

The previous prime is 27744407. The next prime is 27744443. The reversal of 27744421 is 12444772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24611521 + 3132900 = 4961^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 27744421 - 2⁹ = 27743909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27744401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13872210 + 13872211.

It is an arithmetic number, because the mean of its divisors is an integer number (13872211).

Almost surely, 2^27744421 is an apocalyptic number.

It is an amenable number.

27744421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27744421 is an equidigital number, since it uses as much as digits as its factorization.

27744421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12544, while the sum is 31.

The square root of 27744421 is about 5267.2973145628. The cubic root of 27744421 is about 302.7321570059.

The spelling of 27744421 in words is "twenty-seven million, seven hundred forty-four thousand, four hundred twenty-one".